So I should use one error amp as an input buffet and bias the other error amp to have zero o/p voltage from it ? Okay good. But how do I do that ? For the buffer would connect the FEEDBACK pin to the inverting. Or use one of the error amplifiers as buffer. Unused error amplifiers should be biased for low output voltage.
So the error amps are used for varying the duty cycle and the DTC is used for selecting the max duty cycle ? In my case , it should be pulled to ground to ensure max duty cycle. Am I right ? I'm looking to vary the duty cycle from 0 to 90-80 %.DTC sets the maximum duty cycle.
Should I ground both pins ? That way the difference in the inputs would be zero and the output of the amp would be zero.
You can't operate a triac at 20 kHz because the turn-off time is in a 100 µs range. The other question is if your circuit allows triac self turn-off.
What about self turn off ? The circuit is like a usual full bridge AC voltage controller using two thyristors or one triac.
The MOC3041 has a zero cross detector in it. Triggers the triac after the zero crossing of the sinusoidal wave. Maybe that's supposed to do something ? If it didn't work then why would they put it in a textbook ?The circuit can only turn off, if the triac current crosses zero. Don't think that it will work as chopper for you.
Okay so my pwm has to have a frequency equal to or below 50Hz. Well then it seems my approach has been totally wrong. I'll have to generate the pwm using separate oscillator and comparator stages fine tuned for this.For this reason, it's not possible to generate PWM with a triac or thyristor at a higher frequency than that of the AC voltage supply.
A triac or thyristor is a latching switch element. It can't switch of the current after it has been triggered. You have to wait until the external circuit stops the current.
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